程式碼

忽略元素type

function deleteMulti(arr) {
    let obj = {},
        res = [],
        current;
    for (let i = 0; i < arr.length; i++) {
        current = arr[i];
        if (!obj[current]) {
            obj[current] = current;
            res.push(current);
        }
    }
    return res;
}

如果type不同則不刪除

function deleteMulti(arr) {
    let obj = {},
        res = [],
        type,
        current;
    for (let i = 0; i < arr.length; i++) {
        current = arr[i];
        type = typeof current;
        if (!obj[type]) {
            obj[current] = current;
            res.push(current);
        }
    }
    return
 
 res;
}